﻿// ----------------------------------------------------------------------------------
// Microsoft Developer & Platform Evangelism
// 
// Copyright (c) Microsoft Corporation. All rights reserved.
// 
// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, 
// EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES 
// OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
// ----------------------------------------------------------------------------------
// The example companies, organizations, products, domain names,
// e-mail addresses, logos, people, places, and events depicted
// herein are fictitious.  No association with any real company,
// organization, product, domain name, email address, logo, person,
// places, or events is intended or should be inferred.
// ----------------------------------------------------------------------------------

namespace Microsoft.Samples.WindowsPhoneCloud.Web.Infrastructure
{
    using System;
    using System.Web;

    public class BlobRequestValidator : IStorageRequestValidator
    {
        private const string BaseUrl = "/SharedAccessSignatureService";

        private readonly IUserPrivilegesRepository userPrivilegesRepository;

        public BlobRequestValidator()
            : this(new UserTablesServiceContext())
        {
        }

        [CLSCompliant(false)]
        public BlobRequestValidator(IUserPrivilegesRepository userPrivilegesRepository)
        {
            this.userPrivilegesRepository = userPrivilegesRepository;
        }

        public bool DoesRequestApply(Uri resourceUri)
        {
            return resourceUri.AbsolutePath.StartsWith(BaseUrl, StringComparison.OrdinalIgnoreCase);
        }

        public bool ValidateRequest(string userId, HttpRequest request)
        {
            return this.CanUseBlobs(userId);
        }

        private bool CanUseBlobs(string userId)
        {
            return this.userPrivilegesRepository.HasUserPrivilege(userId, PrivilegeConstants.BlobsUsagePrivilege);
        }
    }
}